КТО РЕШИТ ТОМУ 30 БАЛЛОВ

1) [latex] \frac{ac^{2}}{a-b} ; a=-2,4;b=3,6;c=-3\\ \\ \frac{(-2,4)*(-3)^{2}}{-2,4-3,6} = \frac{(-2,4)*9}{-6} = \frac{-21,6}{-6} =3,6[/latex] 2) [latex]-3,1m-(-1+5,9m)+(4-m)=-3,1m+1-5,9m+4-m=\\ =-10m+5[/latex] 3) [latex]2x+5=13x+93\\ 2x-13x=93-5\\ -11x=88\\ x=-8[/latex] 4) [latex] \frac{9900}{7500} =1,32=132%\\ \\ [/latex] т.е цена больше на 132-100=32% 5) [latex]3,5/2,5=2,8/8x= \frac{2,5}{3,5} = \frac{8x}{2,8} \\ \\ \frac{2,5}{3,5}* \frac{2,8}{8}=x\\ \\ \frac{7}{28}=x\\ \\ x= \frac{1}{4} [/latex] 6) [latex]-6,5-(7,2f-(4,3f+(-f-0,9)))=\\ =-6,5-(7,2f-(4,3f-f-0,9))=\\ =-6,5-(7,2f-4,3f+f+0,9)=\\ =-6,5-7,2f+4,3f-f-0,9=\\ =-3,9f-7,4 [/latex] 7) [latex] \frac{5x}{8} - \frac{8x}{5}=1,18\\ \\ \frac{25x}{40}- \frac{64x}{40} =1,18\\ \\ \frac{-39x}{40}=1,18\\ \\ x=1,18*(- \frac{40}{39} ) \\ \\ x=- \frac{118}{100} * \frac{40}{39} \\ \\ x= \frac{4720}{3900} \\ \\ x= \frac{472}{390} \\ \\ x=1 \frac{82}{390} \\ \\ x=1 \frac{41}{195} [/latex]